CN103160733A - Steel plate for nuclear power station pressure vessel and equipment gate, and manufacturing method thereof - Google Patents
Steel plate for nuclear power station pressure vessel and equipment gate, and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a steel plate for a nuclear power station pressure vessel and an equipment gate, and a manufacturing method thereof. The steel plate comprises, by weight, 0.10 to 0.20% of C, 0.15 to 0.35% of Si, 1.00 to 1.65% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.50 to 0.85% of Ni, less than or equal to 0.06% of Cu, less than or equal to 0.15% of Cr, less than or equal to 0.05% of Mo, less than or equal to 0.020% of V, less than or equal to 0.040% of Nb, less than or equal to 0.020% of Ti, 0.020 to 0.050% of Al, less than or equal to 0.015% of N, less than or equal to 0.015% of As, less than or equal to 0.010% of Sn and the balance Fe and unavoidable impurities. The steel plate has good normal-temperature stretching performances, high-temperature stretching performances, thickness-direction stretching indexes and low-temperature toughness, and guarantees use safety in the special environment. The manufacturing method adopts a converter smelting technology under the condition of the existing equipment, strictly controls non-metallic inclusion in smelting and realizes clean steel production. The steel plate obtained by the manufacturing method has a low cost, stable microstructure properties, low-temperature toughness, high-temperature performances, excellent welding performances and hot-working performances, and a ductile-brittle transition temperature TNDT less than or equal to -28 DEG C.
Description
Technical field
The present invention relates to technical field of metal material manufacture, especially relate to a kind of nuclear plant pressure vessels and equipment gate steel plate and manufacture method thereof.
Background technology
By the end of in December, 2012, have at home the operation of 13 nuclear power generating sets, 24 nuclear power generating sets building, nuclear power continues to increase with the steel demand, along with and the nuclear plant pressure vessels and the equipment gate that come increase with the steel plate demand.
As nuclear plant pressure vessels and equipment gate steel, its service condition is harsh complicated, require steel plate used that good over-all properties must be arranged, the indexs such as the high-strong toughness energy under purity, internal soundness, low temperature and the high temperature of steel, non-deformability are had strict requirement.Require to reduce phosphorus, sulphur content in production process, category-A, C class, D class non-metallic inclusion rank are not more than 1.0 grades, category-B non-metallic inclusion rank and are not more than 1.5 grades, rational chemical composition design and strict thermal treatment process, so production process has higher difficulty.
Summary of the invention
The object of the present invention is to provide a kind of high strength nuclear plant pressure vessels and equipment gate steel plate, it has the indexs such as good normal tensile property, high temperature tensile properties and low-temperature flexibility, the present invention also provides the manufacture method of producing above-mentioned steel plate, this method adopts converter smelting, normalizing or quenching+tempering thermal treatment, make steel have good stable structure property, welding property, cold and hot working performance.The technical scheme that adopts is: a kind of nuclear plant pressure vessels and equipment gate steel plate thereof, it is characterized in that: described steel plate comprises: carbon 0.10～0.20%, silicon 0.15～0.35%, manganese 1.00～1.65%, phosphorus≤0.015%, sulphur≤0.005%, nickel 0.50～0.85%, copper≤0.06%, chromium≤0.15%, molybdenum≤0.05%, vanadium≤0.020%, niobium≤0.040%, titanium≤0.020%, aluminium 0.020～0.050%, nitrogen≤0.015%, arsenic≤0.015%, tin≤0.010%, surplus are iron and inevitable impurity, and above per-cent is weight percentage.
Preferably: described steel plate comprises carbon 0.12～0.18%, silicon 0.15～0.35%, manganese 1.20～1.60%, phosphorus≤0.013%, sulphur≤0.005%, nickel 0.50～0.85%, copper≤0.06%, chromium≤0.15%, molybdenum≤0.05%, vanadium≤0.020%, niobium≤0.040%, titanium≤0.020%, aluminium 0.020～0.050%, nitrogen≤0.015%, arsenic≤0.015%, tin≤0.010%, surplus is iron and inevitable impurity.
Preferably: described steel plate comprises carbon 0.15%, silicon 0.25%, manganese 1.45%, phosphorus 0.010%, sulphur 0.003%, nickel 0.70%, copper 0.02%, chromium 0.02%, molybdenum 0.02%, vanadium 0.002%, niobium 0.002%, titanium 0.002%, aluminium 0.030%, nitrogen 0.004%, arsenic 0.00001%, tin 0.00001%, surplus is iron and inevitable impurity.
A kind of manufacture method for the manufacture of nuclear plant pressure vessels claimed in claim 1 and equipment gate use steel plate, comprise 1) hot metal pretreatment, 2) converter smelting and deoxidation alloying, 3) refining, 4) sheet billet continuous casting, 5) the slab stacking slow cooling and reheat, 6) dephosphorize by high pressure water and slab rolling, 7) steel plate stacking slow cooling, 8) thermal treatment process, it is characterized in that: described steel plate thickness is 6-150mm, described 2) in converter smelting and deoxidation alloying, smelting endpoint carbon content target is 0.06～0.10%, P≤0.008%, two pushing off the slag tappings; The tapping temperature target is 1600-1630 ℃; Deoxidation alloying, after tapping in CAS argon blowing time 〉=10 minute; Described 3) in refining, carry out dark desulfurization in the LF refining furnace, and each alloying element is finely tuned to target, carry out Fruit storage at the VD/RH stove, fidelity sky 15～20min feeds the calcium iron wire, soft blow argon time 〉=15min after processing finishes.
Preferably: described 8) thermal treatment process is normalizing or quenching+tempering, and the concrete steps of described normalizing are: 850～950 ℃ of normalizing temperatures, and time inside furnace 1.0～3.0min/mm can not be less than 30min in any case, soaking time 10～20min; The concrete steps of described quenching+tempering are: 800～1000 ℃ of steel plate quenching temperature, time inside furnace 1.0～3.0min/mm, soaking time 10～20min, 500～750 ℃ of steel plate tempering temperatures, time inside furnace 1.0～3.0min/mm, can not be less than 30min in any case, tempering insulation time 10～20min, the steel plate rear air cooling of coming out of the stove.
Preferably: the concrete steps of normalizing are: 870～930 ℃ of normalizing temperatures, time inside furnace 1.5～2.5min/mm.Can not be less than 30min in any case, soaking time 12～18min; The concrete steps of quenching+tempering are: 850～950 ℃ of steel plate quenching temperature, time inside furnace 1.5～2.5min/mm, soaking time 12～18min, 550～700 ℃ of steel plate tempering temperatures, time inside furnace 1.5～2.5min/mm, can not be less than 30min in any case, tempering insulation time 12～20min, the steel plate rear air cooling of coming out of the stove.
Preferably: described 6) dephosphorize by high pressure water and slab rolling continuously cast bloom comprise the dephosphorization of the laggard horizontal high voltage water of heating, 1050～1160 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, the finish rolling stage is perfect recrystallization district's termination, finishing temperature 850-930 ℃.
Preferably: described 1) hot metal pretreatment comprises and makes wherein that sulphur takes off to 0.002-0.005%, through the dark desulfurization pre-treatment of KR and after skimming bright of molten iron greater than 90%, 1250～1350 ℃ of molten iron temperatures, arsenic in molten iron (As)≤0.006%.
Preferably: described 4) pulling speed of continuous casting 0.8-1.5m/min in sheet billet continuous casting, full argon shield casting, process nitrogen pick-up is not more than 0.0015%.
Beneficial effect of the present invention is: the invention discloses nuclear plant pressure vessels that a kind of thickness is 6-150mm and equipment gate with high-strength medium plate formula and corresponding manufacturing process thereof, this steel plate has the indexs such as good normal tensile property, high temperature tensile properties, thickness direction stretching, low-temperature flexibility, thereby has guaranteed the security that steel plate uses in particular surroundings; This technique adopts converter smelting under the existing installation condition, smelting process is strictly controlled non-metallic inclusion, has realized the production of Clean Steel; Adopt the present invention's parts by weight proportioning used element combinations and the method applied in the present invention make steel plate, its cost is low, has stable structure property, low-temperature flexibility and high-temperature behavior, welding property, cold and hot working excellent property, its ductile-brittle transition temperature TNDT≤-28 ℃.
Description of drawings
Accompanying drawing 1 is embodiment light plate metallographic structure figure, and what the figure shows is sample thickness 1/4 place metallographic structure, and enlargement ratio is 500 times.
Embodiment
Below in conjunction with drawings and Examples, the present invention is specifically described.The invention discloses a kind of nuclear plant pressure vessels and equipment gate steel plate, this steel plate comprises: carbon 0.10～0.20%, silicon 0.15～0.35%, manganese 1.00～1.65%, phosphorus≤0.015%, sulphur≤0.005%, nickel 0.50～0.85%, copper≤0.06%, chromium≤0.15%, molybdenum≤0.05%, vanadium≤0.020%, niobium≤0.040%, titanium≤0.020%, aluminium 0.020～0.050%, nitrogen≤0.015%, arsenic≤0.015%, tin≤0.010%, surplus are iron and inevitable impurity, and above per-cent is weight percentage.
This processing step is:
1) hot metal pretreatment: hot metal pretreatment comprises makes wherein that sulphur takes off to 0.002-0.005%, through the dark desulfurization pre-treatment of KR and after skimming bright of molten iron greater than 90%, 1250～1350 ℃ of molten iron temperatures, arsenic in molten iron (As)≤0.006%.
2) converter smelting and deoxidation alloying: smelting endpoint carbon content target is 0.06～0.10%, P≤0.008%, and electrolytic nickel adds converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite and makes the top slag; Adopt floating plug, the two pushing off the slag tappings of scum rod; Deoxidation alloying in CAS argon blowing time 〉=10 minute, adds silicomanganese, aluminium ferromanganese to carry out alloying after tapping successively, and the tapping temperature target is 1600-1630 ℃.
3) refining: LF adopts and makes in early days the white slag mode, adds the fine setting alloy according to composition; The VD/RH vacuum-treat: vacuum tightness is not more than 1.5mbar, empty 15～20 minutes time of fidelity, feed afterwards the calcium iron wire, and after line feeding, argon blowing time is not less than 15 minutes
4) sheet billet continuous casting: pulling speed of continuous casting 0.8-1.5m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
5) slab stacking slow cooling and reheating: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, after heating, tapping temperature was controlled at 1120-1180 ℃ according to 8-10min/mm;
6) dephosphorize by high pressure water and slab rolling: the dephosphorization of the laggard horizontal high voltage water of continuously cast bloom heating, 1050～1160 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, the finish rolling stage is perfect recrystallization district's termination, finishing temperature 850-930 ℃;
7) steel plate stacking slow cooling: steel plate rolls rear employing stacking slow cooling technique, guarantees the homogenizing with microtexture separated out of hydrogen in steel.
8) thermal treatment process: thermal treatment process is normalizing or quenching+tempering, and the concrete steps of normalizing are: 850～950 ℃ of normalizing temperatures, and time inside furnace 1.0～3.0min/mm can not be less than 30min in any case, soaking time 10～20min; The concrete steps of quenching+tempering are: 800～1000 ℃ of steel plate quenching temperature, time inside furnace 1.0～3.0min/mm, soaking time 10～20min, 500～750 ℃ of steel plate tempering temperatures, time inside furnace 1.0～3.0min/mm, can not be less than 30min in any case, tempering insulation time 10～20min, the steel plate rear air cooling of coming out of the stove.Preferably, the concrete steps of normalizing are: 870～930 ℃ of normalizing temperatures, time inside furnace 1.5～2.5min/mm.Can not be less than 30min in any case, soaking time 12～18min; The concrete steps of quenching+tempering are: 850～950 ℃ of steel plate quenching temperature, time inside furnace 1.5～2.5min/mm, soaking time 12～18min, 550～700 ℃ of steel plate tempering temperatures, time inside furnace 1.5～2.5min/mm, can not be less than 30min in any case, tempering insulation time 12～20min, the steel plate rear air cooling of coming out of the stove.
Embodiment: adopt the KR molten iron pretreatment desulfurizing, sulphur content 0.003% after processing, 1267 ℃ of molten iron temperatures, arsenic content 0.003%; Converter smelting: the endpoint carbon content target is 0.08%, P:0.006%, S:0.008%.The tapping temperature target is 1620 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Ferronickel adds converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite and makes the top slag; Add successively silicomanganese, aluminium ferromanganese to carry out alloying, tapping process argon blowing time 13 minutes; LF refining: 1530 ℃ of the temperature of arriving at a station, 1650 ℃ of out-station temperatures.Heat-up time 30min, treatment cycle 59min; VD refining: the empty time 15min of fidelity, vacuum tightness 0.6mbr.Soft blow argon 20min after hello calcium iron wire after VD/RH, soft blow process molten steel face is without exposed; Continuous casting: pulling rate is 1.0m/min, full argon shield casting; Slab rolled off the production line cooling 62 hours; Continuously cast bloom reheats: 240 minutes heat-up times, 1130～1156 ℃ of tapping temperatures; Start rolling temperature: 1048～1060 ℃, finishing temperature: 915～930 ℃; Steel plate normalizing process: 910 ℃ of Heating temperatures, time inside furnace 100min, soaking time 17min, the steel plate rear air cooling of coming out of the stove.The simulation thermal treatment that eliminates stress is done in steel plate sampling, 650 ℃ of Heating temperatures, temperature more than 425 ℃ the time, 135 ℃/h of heating rate, 155 ℃/h of rate of cooling, soaking time 10 hours, the sampling rear air cooling of coming out of the stove.
The chemical composition that heat analysis obtains steel plate is: carbon (C) 0.15%, silicon (Si) 0.25%, manganese (Mn) 1.45%, phosphorus (P) 0.010%, sulphur (S) 0.003%, nickel (Ni) 0.70%, copper (Cu) 0.02%, chromium (Cr) 0.02%, molybdenum (Mo) 0.02%, vanadium (V) 0.002%, niobium (Nb) 0.002%, titanium (Ti) 0.002%, aluminium (Alt) 0.032%, nitrogen (N) 0.0035%, arsenic (As) 0.00001%, tin (Sn) 0.00001%, the thickness of producing steel plate is 50mm.In the present embodiment, specific performance sees Table 1-5.
Table 1 steel plate normal tensile property
Low temperature impact test: carry out low temperature impact test at-20 ℃, shock test adopts v-notch, and Impulse Test Result is as shown in table 2.
Table 2 steel plate-20 ℃ V-type Impulse Test Result
Table 3 thickness direction tensile property
Table 4 Brinell hardness
Table 5200 ℃ high temperature tensile properties
| The steel plate lot number | Rp,N/mm 2 | Rm，N/mm 2 |
| 12TR034213-01 | 370 | 515 |
| 12TR034213-02 | 355 | 495 |
Steel plate b=2a, 180 ° of d=2a clod washes are not split, and are qualified.
According to the GB/T10561-2005 standard, analyzed the inclusion rank of steel plate, result is as shown in table 6.
Table 6 inclusion rating result
According to the GB/T6803-2008 standard, carry out steel plate nil ductility transition drop weight test, as a result T
NDT≤-28 ℃.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also belong to protection scope of the present invention.
Claims (9)
1. a nuclear plant pressure vessels and equipment gate steel plate, it is characterized in that: described steel plate comprises: carbon 0.10～0.20%, silicon 0.15～0.35%, manganese 1.00～1.65%, phosphorus≤0.015%, sulphur≤0.005%, nickel 0.50～0.85%, copper≤0.06%, chromium≤0.15%, molybdenum≤0.05%, vanadium≤0.020%, niobium≤0.040%, titanium≤0.020%, aluminium 0.020～0.050%, nitrogen≤0.015%, arsenic≤0.015%, tin≤0.010%, surplus are iron and inevitable impurity, and above per-cent is weight percentage.
2. according to nuclear plant pressure vessels claimed in claim 1 and equipment gate steel plate, it is characterized in that: described steel plate comprises carbon 0.12～0.18%, silicon 0.15～0.35%, manganese 1.20～1.60%, phosphorus≤0.013%, sulphur≤0.005%, nickel 0.50～0.85%, copper≤0.06%, chromium≤0.15%, molybdenum≤0.05%, vanadium≤0.020%, niobium≤0.040%, titanium≤0.020%, aluminium 0.020～0.050%, nitrogen≤0.015%, arsenic≤0.015%, tin≤0.010%, surplus are iron and inevitable impurity.
3. according to nuclear plant pressure vessels claimed in claim 1 and equipment gate steel plate, it is characterized in that: described steel plate comprises carbon 0.15%, silicon 0.25%, manganese 1.45%, phosphorus 0.010%, sulphur 0.003%, nickel 0.70%, copper 0.02%, chromium 0.02%, molybdenum 0.02%, vanadium 0.002%, niobium 0.002%, titanium 0.002%, aluminium 0.030%, nitrogen 0.004%, arsenic 0.00001%, tin 0.00001%, surplus are iron and inevitable impurity.
4. one kind for the manufacture of nuclear plant pressure vessels claimed in claim 1 and the equipment gate manufacture method with steel plate, comprise 1) hot metal pretreatment, 2) converter smelting and deoxidation alloying, 3) refining, 4) sheet billet continuous casting, 5) the slab stacking slow cooling and reheat, 6) dephosphorize by high pressure water and slab rolling, 7) steel plate stacking slow cooling, 8) thermal treatment process, it is characterized in that: described steel plate thickness is 6-150mm; Described 2) in converter smelting and deoxidation alloying, smelting endpoint carbon content target is 0.06～0.10%, P≤0.008%, two pushing off the slag tappings; The tapping temperature target is 1600-1630 ℃; Deoxidation alloying, after tapping in CAS argon blowing time 〉=10 minute; Described 3) in refining, carry out dark desulfurization in the LF refining furnace, and each alloying element is finely tuned to target, carry out Fruit storage at the VD/RH stove, fidelity sky 15～20min feeds the calcium iron wire, soft blow argon time 〉=15min after processing finishes.
5. use the manufacture method of steel plate according to nuclear plant pressure vessels claimed in claim 4 and equipment gate, it is characterized in that: described 8) thermal treatment process is normalizing or quenching+tempering, the concrete steps of described normalizing are: 850～950 ℃ of normalizing temperatures, time inside furnace 1.0～3.0min/mm, can not be less than 30min in any case, soaking time 10～20min; The concrete steps of described quenching+tempering are: 800～1000 ℃ of steel plate quenching temperature, time inside furnace 1.0～3.0min/mm, soaking time 10～20min, 500～750 ℃ of steel plate tempering temperatures, time inside furnace 1.0～3.0min/mm, can not be less than 30min in any case, tempering insulation time 10～20min, the steel plate rear air cooling of coming out of the stove.
6. use the manufacture method of steel plate according to nuclear plant pressure vessels claimed in claim 5 and equipment gate, it is characterized in that: the concrete steps of normalizing are: 870～930 ℃ of normalizing temperatures, time inside furnace 1.5～2.5min/mm can not be less than 30min in any case, soaking time 12～18min; The concrete steps of quenching+tempering are: 850～950 ℃ of steel plate quenching temperature, time inside furnace 1.5～2.5min/mm, soaking time 12～18min, 550～700 ℃ of steel plate tempering temperatures, time inside furnace 1.5～2.5min/mm, can not be less than 30min in any case, tempering insulation time 12～20min, the steel plate rear air cooling of coming out of the stove.
7. use the manufacture method of steel plate according to nuclear plant pressure vessels claimed in claim 4 and equipment gate, it is characterized in that: described 6) dephosphorize by high pressure water and slab rolling continuously cast bloom comprise the dephosphorization of the laggard horizontal high voltage water of heating, 1050～1160 ℃ of start rolling temperatures, hot stage adds heavy reduction and improves the distortion rate of permeation, reduce last pass, the finish rolling stage is perfect recrystallization district's termination, finishing temperature 850-930 ℃.
8. use the manufacture method of steel plate according to nuclear plant pressure vessels claimed in claim 4 and equipment gate, it is characterized in that: described 1) hot metal pretreatment comprises and makes wherein that sulphur takes off to 0.002-0.005%, bright of molten iron is greater than 90% through the dark desulfurization pre-treatment of KR and after skimming, 1250～1350 ℃ of molten iron temperatures, arsenic in molten iron≤0.006%.
9. use the manufacture method of steel plate according to nuclear plant pressure vessels claimed in claim 4 and equipment gate, it is characterized in that: described 4) pulling speed of continuous casting 0.8-1.5m/min in sheet billet continuous casting, full argon shield casting, process nitrogen pick-up is not more than 0.0015%.
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| CN103866187A (en) * | 2014-03-24 | 2014-06-18 | 济钢集团有限公司 | Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof |
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| CN110724878A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 0.5Ni low-temperature steel and manufacturing method thereof |
| CN112143976A (en) * | 2020-08-24 | 2020-12-29 | 江阴兴澄特种钢铁有限公司 | P265GH steel plate for nuclear power and manufacturing method thereof |
| CN113667897A (en) * | 2021-08-31 | 2021-11-19 | 重庆钢铁股份有限公司 | Low-temperature toughness steel and P, As matching process thereof |
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